#7542: GHC doesn't optimize (strict) composition with id -------------------------------------+------------------------------------- Reporter: shachaf | Owner: simonpj Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): That does look good. I don't know how we can determine whether the problem is sufficiently fixed. We have an interaction between a weird language feature (detectably lifted functions) and a somewhat illegitimate compiler transformation that tries to avoid paying too much for those. Everything feels a bit brittle and ill-specified. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/7542#comment:28 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler